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Finding the Fourth Proportional to 12,671.20, 19,008.60 and 3,905.20

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Solution

The fourth proportional to 12,671.20, 19,008.60 and 3,905.20 is: 5,858.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,671.20 : 19,008.60 = 3,905.20 : x
  2. Step 2: Convert to fraction form
    12,671.20/19,008.60 = 3,905.20/x
  3. Step 3: Cross multiply
    12,671.20x = 19,008.60 × 3,905.20
  4. Step 4: Simplify right side
    12,671.20x = 74,232,384.72
  5. Step 5: Solve for x
    x = 74,232,384.72/12,671.20
  6. Step 6: Final answer
    x = 5,858.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.